package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public  static  final  String WX_LOGIN ="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 微信登陆
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());



        //判断这个openid是否为空,如果为空，表示登陆失败，抛出业务异常
        if(openid ==null){
            throw  new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是不是新用户
       User user= userMapper.getByOpenid(openid);

        //如果是新用户，自动完成注册
        if (user ==null){
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();

            userMapper.insert(user);

        }


        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        //设置appid
        map.put("appid",weChatProperties.getAppid());
        //设置secret
        map.put("secret",weChatProperties.getSecret());
        //设置js_code
        map.put("js_code",code);
        //设置grant_type
        map.put("grant_type","authorization_code");

        //返回来的是json数据
        //调用微信接口服务
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //将返回的json数据转换为JSONObject对象
        JSONObject jsonObject = JSON.parseObject(json);
        //获取openid
        String openid = jsonObject.getString("openid");

        //返回openid
        return openid;
    }
}
